Technical Drawing - Exam Papers - Higher - 1992 - Building
On a contour map A and B are two points whose altitudes are 105m and 85m, respectively. On the map B is located 100m north-east of A. A skew bore-hole at A is drilled in a northerly direction in plan and has an actual inclination of 50° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at altitudes of 90m and 45m, respectively.
A skew bore-hole at B is drilled in a south-easterly direction in plan and has an actual inclination of 60° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at altitudes of 55m and 25m, respectively.
(a) Determine the dip, strike and thickness of the stratum.
(b) Determine the inclination of the bore-hole at B to the stratum.